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Finding the Fourth Proportional to 288.57, 431.80 and 248.47

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Solution

The fourth proportional to 288.57, 431.80 and 248.47 is: 371.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    288.57 : 431.80 = 248.47 : x
  2. Step 2: Convert to fraction form
    288.57/431.80 = 248.47/x
  3. Step 3: Cross multiply
    288.57x = 431.80 × 248.47
  4. Step 4: Simplify right side
    288.57x = 107,289.35
  5. Step 5: Solve for x
    x = 107,289.35/288.57
  6. Step 6: Final answer
    x = 371.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.